单项选择题

案例分析题 The plane was ______.

A．flying some businessmen to London
B．on a regular flight to London
C．returning from a trade fair
D．bound for Carlisle
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单项选择题
According to the passage, which group of people seem to age slower than the others
A．Farmers.
B．Lawyers.
C．Clerks.
D．Shop assistants.
单项选择题
The underlined word subjects in paragraph 5 means ______.
A．branches of knowledge studied in a school
B．something to be considered
C．persons experimented on
D．citizens in a country
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